A registered letter is handled with additional security. It's also tracked, unlike an “ordinary letter.” There's a third category called “certified.” It's less expensive than a registered letter but will provide the tracking service. You'd usually use a registered letter if there was value in what was being mailed.
Registered mail is a postal service in many countries which allows the sender proof of mailing via a receipt and, upon request, electronic verification that an article was delivered or that a delivery attempt was made.
USPS Assistance with Preparing Registered Mail Packages Accepting Registered Mail items for mailing and shipping can be done by retail associates at any post office, station, or branch. Rural carriers can also accept Registered Mail, provided the required postage and fees are prepaid.
The addressee has 15 calendar days to pick up your registered mail with confirmation of receipt (in the Post Office or Post Point mentioned on the failed delivery notice). If the addressee does not pick up your mail within 15 calendar days, it will be sent back to you.
While Certified Mail provides proof of shipment and delivery, Registered Mail provides updates throughout the entire shipment process. By receiving updates after each USPS employee passes off your package, you can relax thanks to the additional security.
The registered letter with acknowledgment of receipt (LRAR) is of legal importance. First of all, it constitutes indisputable proof of both the sending and the receipt of a document, which is evidenced by the acknowledgement of receipt signed by the addressee, which is crucial in contentious or administrative contexts.